Information Security Resources

Entries Tagged ‘work factor’

Firewall: The Realization of a Company’s Internet and Network Access Policy

The original definition of a firewall is: “a partition made of fireproof material to prevent the spread of a fire from one part of a building or ship to another or to isolate an engine compartment, as on a plane, automobile, etc.” 1 Today, in the computer world, the term refers to any piece of […]

Leave a Comment

Cryptography – Revisited

Cryptography, or cryptology, derived from the Greek words for “hidden” writing or speaking, is the practice and study of hiding information. Until modern times, cryptography referred almost exclusively to encryption, the process of converting ordinary information (plain text) into unintelligible gibberish (confidentiality). Cryptography is now considered to be a branch of both mathematics and computer […]

Leave a Comment

Work Factor : Uncovering keys in cryptosystems

Work Factor is defined as the amount of effort (usually measured in units of time) needed to break a cryptosystem. The Work Factor of a cryptosystem is related to its key-length and the working mechanism used (encryption and decryption algorithms). For example, if the brute force attack method is used to break the system (trying […]

Comments (2)

Monoalphabetic Substitution Encryption

To improve Caesar Cipher Encryption, we can assign each alphabet with another one in an non-sequential manner. For example A can be mapped to D while B can be mapped to R, and so are the rest being mapped to a different alphabet. Recall that Caesar Cipher has a key space of 25, Monoalphabetic Substitution […]

Leave a Comment